Circuit Description

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

The throttle position (TP) sensor incorporates two ratiometric TP sensors into one housing. TP sensor 1 and TP sensor 2 each have a 5-volt reference circuit supplied by the throttle actuator control (TAC) module. The TAC module supplies each TP sensor with a low reference circuit. Each TP sensor supplies the TAC module with a signal voltage that is proportional to the throttle blade position. Both of the TP signal voltages increase as the throttle blade is opened. The TP sensor 1 and the accelerator pedal position (APP) sensor 1 share a 5-volt reference circuit that is bussed within the TAC module. The TP sensor 2 and the APP sensor 2 share a 5-volt reference circuit that is also bussed within the TAC module. When this DTC sets, the Reduced Engine Power indicator will be displayed.

This DTC incorporates the following diagnostic tests:

The TP sensor 1 and the TP sensor 2 correlation
The throttle blade minimum position correlation between the TP sensor 1 and the TP sensor 2
The TP sensor 1 signal shorted to a 5-volt reference, a ground, or the TP sensor 2 signal circuit

If the powertrain control module (PCM) detects one or more of the TP sensor 1 tests are out of range, DTC P2135 sets.